Which part or parts of the paragraph indicate the relationship between public support

Which part or parts of the paragraph indicate the relationship between public support and the enforcement of environmental policies?
a new manufacturing company was the brainchild of five engineers. they created a device that controls a company's carbon footprints. to spread
awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints. they constantly followed up with
congressional representatives and found a sponsor and several co-sponsors for the bill